题目

喝进体内的水，有一部分会随尿液排出，这部分水不一定会经过的器官是（ ）A． 肾静脉 B． 肺 C． 肾动脉 D． 心脏 答案：ATo their surprise, they found the lecture given by the famous professor easy ______.   A. to be understood     B. to understand       C. understanding       D. understood